common: add test for empty val
common: add test for empty val

napramirez/packer,pvandervelde/packer,jae2/packer,zakuro9715/packer,taliesins/packer,burnzy/packer,sobrinho/packer,timsutton/packer,styro/packer,rickard-von-essen/packer,boumenot/packer,timsutton/packer,dave2/packer,paulvollmer/packer,napramirez/packer,Silver90/packer,mgk/packer,aneeshusa/packer,Cbeck527/packer,mohae/packer,BayanGroup/packer,mitchellh/packer,tb3088/packer,israelshirk/packer,paulvollmer/packer,AlphaStaxLLC/packer,Banno/packer,fnoeding/packer,Silver90/packer,Sheile/packer,sequenceiq/packer,eranchetz/packer,Sheile/packer,hazelesque/packer,pearkes/packer,BayanGroup/packer,sneal/packer,rodm/packer,sansb/packer,jmptrader/packer,Akasurde/packer,vtolstov/packer,AlphaStaxLLC/packer,jimmythedog/packer,ephemeralsnow/packer,dev-head/packer,sean-/packer,jasonchaffee/packer,markpeek/packer,qur/packer,zeliff/packer,pearkes/packer,kgrvamsi/packer,stagrlee/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,mafrosis/packer,vtolstov/packer,rk295/packer,marc-ta/packer,ephemeralsnow/packer,ttaylor249/packer,rk295/packer,zakuro9715/packer,icnocop/packer,rickard-von-essen/packer,Xiol/packer,Cbeck527/packer,evertrue/packer,eranchetz/packer,markpeek/packer,leroux/packer,tas50/packer,quantang/packer,youhong316/packer,ricardclau/packer,atlassian/packer,visioncritical/packer,kgrvamsi/packer,jmptrader/packer,masbog/packer,ricardclau/packer,sneal/packer,jarl-dk/packer,KohlsTechnology/packer,esemplare/packer,Akasurde/packer,manicai/packer,hashicorp/packer,marc-ta/packer,rodm/packer,noplay/packer,markpeek/packer,fnoeding/packer,mgk/packer,monsterzz/packer,timsutton/packer,jean/packer,trumant/packer,sansb/packer,qur/packer,youhong316/packer,pvandervelde/packer,dayglojesus/packer,evertrue/packer,arizvisa/packer,burnzy/packer,sgirones/packer,tb3088/packer,visioncritical/packer,quantang/packer,higebu/packer,orivej/packer,jean/packer,zeliff/packer,beni55/packer,atlassian/packer,mvanholsteijn/packer,atlassian/packer,gildas/packer-hyperv,ttaylor249/packer,tsmolka/packer,legal90/packer,mitchellh/packer,eranchetz/packer,Banno/packer,shaunduncan/packer,napramirez/packer,monkeylittleinc/packer,rrva/packer,justincampbell/packer,blairham/packer,jasonchaffee/packer,jamesleech/packer,avldya/packer,legal90/packer,arizvisa/packer,bryson/packer,esemplare/packer,shaunduncan/packer,burnzy/packer,manicai/packer,taliesins/packer,jszwedko/packer,danschaffer/packer,smaato/packer,tsmolka/packer,pearkes/packer,bryson/packer,quantang/packer,cyberhouse/packer,mgk/packer,mwhooker/packer,mafrosis/packer,jarl-dk/packer,ldejager/packer,marc-ta/packer,gbarberi/packer,leroux/packer,higebu/packer,mayflower/packer,btd/packer,Akasurde/packer,sequenceiq/packer,feateds/packer,mkuzmin/packer,yoctocloud/packer,paulmey/packer,lantrix/packer,jsternberg/packer,p1-nico/packer,zhuzhih2017/packer,mgk/packer,smaato/packer,jsoriano/packer,legal90/packer,grubernaut/packer,tb3088/packer,zhuzhih2017/packer,monkeylittleinc/packer,mefellows/packer,life360/packer,tracyde/packer,beni55/packer,mkuzmin/packer,yonglehou/packer,AlphaStaxLLC/packer,zhuzhih2017/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,Xiol/packer,ldejager/packer,c22/packer,zakuro9715/packer,p1-nico/packer,grubernaut/packer,grubernaut/packer,jszwedko/packer,orivej/packer,bryson/packer,smaato/packer,sean-/packer,danschaffer/packer,ttaylor249/packer,sneal/packer,rnaveiras/packer,jsternberg/packer,LinusU/packer,dave2/packer,dantran/packer,pecigonzalo/packer,rk295/packer,blairham/packer,life360/packer,zhuzhih2017/packer,evertrue/packer,israelshirk/packer,masbog/packer,arizvisa/packer,samdunne/packer,p1-nico/packer,routelastresort/packer,jgkim/packer,jszwedko/packer,tsmolka/packer,orivej/packer,jonathankarsh/packer,quantang/packer,grange74/packer,jszwedko/packer,zeliff/packer,trumant/packer,zeliff/packer,mkuzmin/packer,ober/packer,eranchetz/packer,esemplare/packer,mindjiver/packer,p1-nico/packer,leroux/packer,gildas/packer-hyperv,monkeylittleinc/packer,dave2/packer,tracyde/packer,styro/packer,visioncritical/packer,jarl-dk/packer,KohlsTechnology/packer,Cbeck527/packer,hazelesque/packer,paulmey/packer,stagrlee/packer,sean-/packer,bryson/packer,noplay/packer,KohlsTechnology/packer,DualSpark/packer,trumant/packer,monkeylittleinc/packer,ober/packer,noplay/packer,mansunkuo/packer,bhcleek/packer,jean/packer,pvandervelde/packer,ricardclau/packer,sobrinho/packer,ephemeralsnow/packer,israelshirk/packer,bhcleek/packer,threatstream/packer,uber/packer,KFishner/packer,bensojona/packer,ricardclau/packer,fnoeding/packer,lantrix/packer,ober/packer,p1-nico/packer,mansunkuo/packer,cyberhouse/packer,jamesbishopp/packer,mafrosis/packer,sequenceiq/packer,atlassian/packer,uber/packer,ricardclau/packer,yonglehou/packer,bryson/packer,shaunduncan/packer,monsterzz/packer,bensojona/packer,sequenceiq/packer,routelastresort/packer,tomwilkie/packer,Sheile/packer,mvanholsteijn/packer,kpettijohn/packer,KFishner/packer,grange74/packer,legal90/packer,mwhooker/packer,jimmythedog/packer,yoctocloud/packer,kpettijohn/packer,mayf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